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Debt Debt, Textuals (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Debt Instrument [Line Items]      
Debt, Weighted Average Interest Rate 6.69% 6.80%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 89.00% 93.00%  
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000,000 $ 400,000,000  
Letters of Credit, Maximum Borrowing Capacity   175,000,000  
Line of Credit Facility, Amount Outstanding 65,000,000 0  
Letters of Credit Outstanding, Amount 32,700,000    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%    
Line of Credit Facility, Remaining Borrowing Capacity 402,300,000    
Proceeds from Issuance of Senior Long-term Debt   250,000,000  
Repayments of Long-term Debt 46,000,000 122,200,000  
Gains (Losses) on Extinguishment of Debt (3,509,000) (9,400,000) 3,146,000
Write off of Deferred Debt Issuance Cost 400,000 1,400,000  
Debt Instrument, Unamortized Premium 3,100,000 8,000,000  
Capital Lease Obligations Incurred 31,300,000 22,800,000 64,100,000
Pledged Assets Separately Reported, Finance Receivables Pledged as Collateral, at Fair Value 4,100,000 15,600,000  
Debt Instrument, Unamortized Discount 4,900,000 6,100,000  
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position 2,800,000 3,600,000  
February 2013 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.875% 7.875%  
Repayments of Long-term Debt 3,800,000 25,500,000  
October 2014 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   7.375%  
Repayments of Long-term Debt   70,500,000  
April 2015 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.75% 6.75%  
Repayments of Long-term Debt 20,800,000 3,000,000  
April 2016 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.75% 6.75%  
Repayments of Long-term Debt $ 15,600,000 $ 20,100,000  
June 2017 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.00%    
May 2019 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   7.00%  
November 2021 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.00%